TL* THE CONTACT OWNS A 1999 FORD EXPEDITION. THE CONTACT STATED THAT THE HORN ACTIVATED INDEPENDENTLY. AFTER INSPECTING THE VEHICLE, THE CONTACT NOTICED THAT THE FAILURE WAS DUE TO A FIRE UNDER THE HOOD TOWARD THE DRIVER SIDE OF THE VEHICLE. THE CONTACT STATED THAT SMOKE AND FLAMES WERE EMITTING FROM THE VEHICLE. THE FIRE DEPARTMENT WAS CONTACTED. HOWEVER, THE FIRE DID NOT EXTINGUISH RESULTING IN THE VEHICLE EXPLODING. THE MANUFACTURER WAS NOT NOTIFIED. A POLICE REPORT WAS FILED AND THERE WERE NO INJURIES SUSTAINED. THE APPROXIMATE FAILURE MILEAGE WAS 163,000.